Hot-blast stove



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HOT BLAST STOVE.

PatentedNov. 2, 1886.

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M. SGOVEL.

HOT BLAST STOVE;

Patented Nov. 2, 1886.v

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No. 351,804. PatentedNov. 2, 1886.

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.. 2ov more, heating them up, theblastis being forced UNITED STATES PATENT GFFICE.

MINOR SCOVELOF PITTSBURG, PENNSYLVANIA.`

HOT-BLASTv srovE.

SPECIFICATION forming part of Letters Patent No. 351,804, dated November 2, 1886.

Application filed January 12, 1886.

T all whom tm/ay concern:

Be itknown that I, MINOR SCovEL, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful 5 Improvement in Hot-Blast Stoves; and I do hereby delare the following to be a full, clear, and exact description thereof.

My invention relates to vertical hot-blast stoves which are heated by the waste gases zo from the furnaces and are utilized to heat the blast. These stoves are provided with valves for reversing the currents by which they are traversed, so that at one time the waste heat from thel furnace is passing through them in one direction, and later the blast of air from the blowing-engine is` being forced through them in the opposite direction'into the furnace. They areused in couples, so that while the waste heat is passing out through one or in th rough an equal number, which have been previously heated by the passage therethrough for a time of the hot waste-gases. When one set becomes heated and the other cold by the currents passing through them, the valves are reversed, and then the currents pass in the opposite directions.

My invention relates to that class of stoves in which the interior is composed of a series 3o of vertical channels through refractory brickwork, and designed to give a long run to the gases and air over the same, for; the purpose of taking up from the hot gases all the heat contained therein and' to impart the same, in 3 5 turn, to the iniiowing air. It is a common construction of such stoves` to have a number of vertical passages, so that the currents pass up and downV through the stove severaltimes between the adit and exit`points. It is also usual 4o to have a combustion-chamber next to the gasadit, and to supply to such combustion-chamber air for the purpose of ignting and burn- /ing the gas. Y

Stoves have been constructed in which a second combustion-chamber was'a'rranged between the iirst combustion-chamber and the exit-point, thepurpose of which was to revivify the combustion and impart a higher degree of heat to the remaining passages; but this construction has been found to be defective, in that the second combustion took place in a Serial No. 188,317. (No model.)

by reference to the accompanying four sheets of drawings, in which` Figure l-is a vertical section of my improved 6 5 stove on the line A A of Fig..3. Fig. 2 is an elevation, partly in section, on the line B B of Fig. 8. Fig. 3 is a cross-section partly on the line C C and partly on the line D D of Fig. 1. Fig. is a vertical sect-ion on the line E Eot 7o Fig. 3. Y

Q Like symbols of reference indicate like parts in each.

The stove has a cylindrical metallic shell, a, lined with brick-work I), an adit-opening, c, which admits the gas, an exit-opening, d, leading to the stack, and an opening, e, for the admission of cold air, said parts being arranged as usual, and the passage connecting with Ythe gas adit and exit openings being provided with valve-chambers c d', of the usual construction. Inside of the stove are two uptakepassages, f h, and two downtake-passages, g fi, the said passages being separated by walls 2, 3, and/1. The downtake-passages'g and i are divided into numerous small channels by brickwork 5 6. The passages f' and gare connected at the top by the chamber or passage 7, g and h at the bottom by passages or chambers 8, and 7i andi at the top vby a passage or` chamber, 9. The passage j' constitutes the iirst combustion-chamber, and has an unobstructed interior. The passage his divided by vertical walls l0 in two, and between these vertical walls is a passage, k, which constitutes a central combustion-chamber and communicates at its bottom'with the downtake-passage g by means of an opening, 11, extending below the level of the passages 8, which lead from said passage g into the lower ends of the two uptake passages h. At the lower end of the combustion chamber or passage f are doors or ICO Openings m, for admitting air thereto. Opening into the sides of the centralI combustionchamber 7.', at the bottom of the same, is a flue, n, for admitting gas, the entrance of which is controlled by a suitable valve in a valve-,chamber, n, and extending in from the opposite side is a iluc, o, for admitting air to effect the combustion of said gas.

Thus constructed, the operation of my improved stove is as follows: The gas being admitted at c meets the air from the openings m and is burned in the combustion-chamber f. The heat and products of combustion pass upward through f, through the chamber 7 down through the passage g, through the horizontal passages S, into the vertical passages h, thence up and through the passage 9, down through the passagct' to the exit d, whence they are lcd to the stack. At the same time gas entering through the ilue u, at the base of the middle combustion-chamber k, is met by the air from the ue o, and is burned in the vertical chamber 7c, the products of combustion pass ing up through chamberk into the connectingpassage 9, and thence down through the passage t to the stack. The waste products from the iirst combustion-chamber do not enter the chamber k by reason of the fact that they find an escape through the higher passages 8,which are of such size as to accommodate their entire volume, so. that they will not descend far enough in the passage g to pass through the opening 11, which communicates with the lower end ofthe chamber h. Then the valves are reversed, so as to cause the air to pass through the stove, the air is admitted from the blowing-engine through the pipe e, and passes up through the passage t', down h h and k, up through g, down f, and out to the furnace in the usual Way. The purpose of the opening ll is to permit the air to pass through the chamber 7; and take up the heat from its walls. Otherwise there would be no need of such an opening, and it would not be provided. It is placed sufiiciently below the openings 8 to prevent the waste products of combustion from the passage r/ from passing through it into the chamber 7.1, aud interfering with thc combustion going on therein.

I do not limit myself to the use of a second combustion-chamber, k, which communicates with the preceding Waste-flue, because it is evident that such communication is not necessary t0 its use as a combustion-chamber. y returnpassages I mean passages ruiming in opposite directions, and thereby include all the vertical passages I have shown.

I do not limit myself to the use of but one separate combustion-chamber, because, if dcsired, two or more may be used. If desired, air may be admitted at the bottom of the tlues 71, to complete the combustion of any unconsumed gas that may reach that point.

Vhat I claim as my invention, and desire to secure by Letters Patent; is-

I. In a vertical regenerative hot-blast stove having an initial combustion-chamber and vertical return-passages, a second combustion chamber provided with gas and air inlets, arranged in one of the vertical passages, and

separated from the waste-passages, substan-l tially as and for the purposes described.

2. In a vertical regenerative hot-blast stove having an initial combustion-chamber and vertical return-passages, making a continuous run for the products of combustion from the combustion-chamber to the exit-point, the combination, with the vertical passages, of a separate combustion-chamber arranged in one of the uptake-passages, and connnunicating with the preceding downtake-passage at a point below the openings through which the waste products pass from such downtalce-passage, substantially as and for the purposes described.

3. A Vertical regenerative hot-blast stovel having one of its uptake-passages divided by vertical Walls into separate chambers, one of which is provided with air and gas inlets to act as a combustion-chamber, and communicates with the preceding down-passage, and the others act as waste-dues and communicate with said down-passage at a point above that at which the first-named chamber communicates therewith, so that the waste products from such down-passagc shall not enter said combustion-chamber, substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand this 5th day of January,'A. D. 1886.

MINOR SCOVEL.

Vitnesses:

IHoiras B. KEER, W. B. ConWIN. 

